Strom



(No Model.)

A. V.- RINGSTROM.

GRINDING, ABRADING, OR CUTTING MATERIAL AND MODE 0F PREPARING SAMEL No.604,569. j Patented May 24,1898.

WITNESSES: INVENTOR ATTORNEY G T VILHELM S M; F OREBRQ, SWEDEN, ASSIGNQRTO S particles of abradin'g material.

UNITED STATES PATE T I Evvm FRYKHOLMf-OF STOOK-HQLM, SWEDEN.

enmnme, Aammme, on CUTTING-MATERIAL Am) MODEOF PREPARING smr.

'srscmcurrox forming part or utters rams no. 604,569, dated m 24, 189 s.7 Application filed December 26, 1895. Serial No. 573,898- (10 model.) d

To all whom may concern;

, Be it known thatI, A GUSTVILHELMRING strnom, a subject of the King ofSweden and Norway, and a resident of 34 Storgatan;0rebro, in the Kingdomof Sweden, have invented certain new and useful Improvements inGrinding,Abrading, or Cutting Materials and in the Mode of Preparing theSame, of which the following is a specification.

This invention relates to the class of compositionsfor grinding,abrading, cutting, or polishing wherein the abrading material in bits orpieces is united in a mass of the proper form by means of metal used asabinding agent. mode has been applied only in-making mi1l-' stones, whererelatively large bits orpieces of emery have been united or joined in amass by simply pouring over or among them metal-as zinc,forexample-which has a comparatively low melting-point My invention doesnot employ the abrading material in coarse bitsorpieces, but in fineparticles, like sand, and it has been found impracticable with a mass ofsuch fine material to unite all of the particles to each other with.molten metal by simply mixing the latter with the To overcome thisdifiiculty and to provide a cutting or abrading surface on the articleor tool is the object of the present invention, which con-.

, sists, essentially, in first coating each particle or grain of theabrading material with metal,

then mixing the coated particles with molten metal or metallic alloy,and then casting the mass to give it the proper form.,

- In carrying out the invention I take fine particles of theabradin'gmaterialsuch as diamond-dust, corundum, carborundum, emery,&c.and give to each particle or granule of such material a metalliccoating. This coating may be applied in several ways. For example, theabrading material may be placed in a suitable solution of a metallicsalt, to

which a reducing agent is added-for instance, a solution of oxid ofsilver in ammonia, to which is added a reducing agent, as

grape-sugar, tartaric acid, &c. -or a coating of metal may be appliedmechanically-for example, by first coating the particles or granules ofthe abrading material with some Heretofore, so far as I am aware, thisrefractory adhesive substance (as waterglass, so .called) and thencoating the particles fwith powdered metal or metal-dust, which latteris causedto adhere to the particles 'by the water-glass. This may beeffected by putting the particles of abrading material in a mixing-drumwith a suflicient quantity of the water-glass to cover them, then addingto the mass a suflicient quantity of the metal-d ust, and then shakingor agitating the mass until the particles are all thoroughly coated. Themetallic coating, however applied, will be a mere film, very thin; butit will have suflicient strength to answer the purposes intended if themetal used for binding or connecting the particles in forming the toolorarticle has a lower melting-point than the coating metal and does notreadily alloy with the latter. Otherwise the coating or film of metal onthe particles must be strengthened by applying a thicker coating,according to the well known electroplating process or byelectroplatingalone, in which case the particles or granules of abradingmaterial will be first coated with graphite, manganese per: oxid, &c.,in lieu of metallic dust. This electroplating may beconveniently-effected by first coveringthe particles of abradingmaterial with a conducting coating or film, as explained, and thenimmersing them in a suitable metallic-salt bath-f0r instance, analkaline copper-salt bath-wherein they are allowed to come in contactwith the electropositive metal, as zinc. This will give them a coatingof copper. The coated particles are now mixed with the molten metal oralloy,

which is to embed them and bind them together. Such metal or alloy mayconsist of a suitable metal and sulfur, phosphorus, carbon, silicon, orother metalloid. As regards the form of the abrading tool or article,the composition may be cast into the form of disks of diiferent sizesand shapes or be cast on the surfaces of wires or ropes, such asendless.

ropes for use in cutting stone, &c. .It can also be cast on cloth and onthe edges of thin metal plates to be used as saw-blades. After thecompound has been cast the points or cut- A this may be done away themetal with a Meawmh water or oil, but prefdisso1ving the metal away withI flgzcorrosive chemicals; or if the bind- ;Z7etal be an electropositiveone, as zinc, 1 1, 5 denudation of the particles may be-af- ,cted bygalvanism in awell-known manner. The tool may be sharpened from time totime by this same mode of denudation of the angles or edges of theparticles of cutting or abrading material.

In the accompanying drawings, which illustrate the invention, Figure 1is an enlarged 15 or magnified fragmentary view of a part of a toolconstructed according to my invention; and Fig. 2 is a view on a similarscale, showing some of the metal-coated particles or granules beforebeing bound together by the embedding metal.

In the views, a represents the coated granules of abrading material, andb the binding or imbedding metal.

Having thus described my invention, I claim-- molten metal, andthen'shaping said mixture into suitable forms for use.

2. As an improved article of manufacture, an abrading or cutting toolhaving its surface composed of a mass of fine particles or granules ofhard abrading material, each coated with a film or metal, and anembedding or binding metal about and among said granules, the bindingmetal having a lower melting-point than that of the metal with which thegranules are coated, substantially as set forth.

In witness whereof I have hereunto signed my name in the presence of twosubscribing witnesses.

AUGUST VllillELM RlNGSTRiiM.

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